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2. Types in lambda calculi and programming languages;Barendregt,1990
3. Needed reduction and spine strategies for the λ-calculus;Barendregt;Inform. and Comput.,1987
4. Checking Landau's “Grundlagen” in the AUTOMATH system;van, Benthem Jutting,1977
5. The mathematical language AUTOMATH, its usage and some of its extensions;de Bruijn,1970